I'm no expert on biology so I couldn't say for sure though the pain only manifests itself when pressing from the chest. Pressing from the ear a la dumbbell presses causes no pain at all. So it's the first few inches from the chest only. Doesn't seem to affect any other lift either: Benches Shrugs chins are all unaffected pain wise. I had a similar issue a couple of years ago and it took 6 weeks to heal properly. Difference was, that injury affected a lot of my lifts.

Could be a minor tear. I was able to OHP with a shoulder tear, but was not able to bench. Just take ti day by day and it should heal.

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May have to watch some MAB's beasts do heavy GM's to make sure I am getting it right.

I like a slightly wider stance than what you use for squats. I do mine similar to a squat in that I try to push my hips back and down a bit. I personally see not point in keeping the hips high and legs straight. Both the deadlift and squat involve raising and lowering of the hips, so I want the good morning to be closer to this, while being more lower back focused.